Explain how the way a commodity index is built influences its returns
The idea
Commodity indexes that look alike can deliver very different returns because of how they are built. Weighting sets the exposure: a production-weighted index is dominated by energy and behaves much like an oil fund, while indexes using liquidity weights or sector caps are more diversified. Rolling rules matter: an index that always rolls into the next front-month contract earns whatever the curve gives, whereas one that picks the contract with the most favourable roll can soften contango losses. Rebalancing matters too: resetting to fixed weights adds value when prices mean-revert and costs value when prices trend. Governance and the list of eligible contracts also differ. The trap is comparing index returns without checking weights, roll method and rebalancing rules.
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- Analyse how spot and futures prices relate when markets are in contango and when they are in backwardation
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